Piston-head packing.



No. 730,168. I v PATENTED JUNE 2,1903

J.'I.R. SEEMER. V V I 'PISTON HEAD PACKING.

APPLICATION FILED SEPT. 3, 1901.

FIGJ- N0 MODEL.

" WT TR I Z R-SQWmWQ 1 I 7; (72217".

UNITED STATES Patented June 2, 1903-.

JOHN R. SEEMER, OF NORFOLK, VIRGINIA.

PlSTON-HEADPACKING- srEcIrIcA'rIon forming part of Letters Patent No. 730,168, dated June 2, 1903. Application filed September 3, 1901. erial No. 74,131. (No model) To all whom, it may concern: I

Be it known that I, JOHN R. SEEMER, a citizen of the United States, and a resident of Norfolk, in the county of Norfolk and State of Virginia, have made a certain new and useful Invention in Pistons; and I declare the follow-.

ing to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the invention, reference being had-to the accompanying drawings, and to letters of ref erence marked thereon, which form a part of this specification.

Figure 1 is a section on the line a: :r, Fig. 2. Fig. 2 is an end elevation of the piston-head. Fig. 3 is a detail perspective View of one of the valves'l. Fig. 4 represents detail views illustrating the joint of the packing-ring c.

This invention relates to pistons for use in connection with the cylinders of steam or other engines and for other purposes; and it consists in the novel construction and combination of parts, all as hereinafter described, and pointed out in the appended claims.

. In the accompanying drawings, illustrating the invention, the letter a designates the 1101- low body of a steam-cylinder piston-head, and b the plate or head covering upon one side of said body.

0 indicates the annular recess in the body.

6 is the outer packing-ring, and f f the nar row backing-rin gs, against which the packingring 6 closes into the edge recess or peripheral channel g of the piston-head. The packing e is formed usually with a flange or projection or rib h extending around the middle of its inner peripheral portion and serving to separate the narrow backing-rings f f from each other.

In the peripheral wall of the piston-head, between the recess 0 and the rim-channel are provided a series of perforations it through which steam is admitted to the rimchannel back of the packing-ring.

At different points in the body of the piston are provided the reciprocatingor doubleacting valves Z, said valves being located and working in the recess 0. Each valve is formed usually with a conical head on at each end and is provided with the extension-guides p, which may be a part of the valve or may be secured thereto by means of screw ends, as

indicated. These extension-guides are lo cated in the base-openings or lateral wall= passages r. of the piston-head and are radially grooved or channeled toprovide for the ready passage of the steam or other elastic medium into the hollow piston-head and out therefrom. In order to provide means fonreadily placing the valves in position'in the hollow body, openings t are made in one side of such body or head and in the covering-plate when used, said openings being of larger diameter than the valves. Theopenings 2- are threaded to receive the threaded plugs s, which are provided with passages 41 for the reception of the extension-guides 10.

The inner ends of the plugs s aremade in valve-seat form, as are the inner ends of the opposite passages 1" through the lateral wall of the head. The plugs 8 being adjustable, the distance between the valve-seats can be regulated to suit the valves, which are designed to have a little play back and forthvrelative to said valve-seats.

'When in operation, the pressure of the steam which enters the hollow piston-head by the channeled extension-guides of the valves presses the opposite valve-head against its seat, and at the same time passing through the perforations 74; operates against the narrow backing-rings and the packing-ring to F expand the latter as required in order to keep it up to its Work. When steam is admitted alternately through the other face of the piston-head, the valves are pressed to their seats 011 the opposite side, and the force of the steam is again exerted against the packingring.

The large packingyring e is joined at its ends with a double tongue-and-groove joint, as. indicated at n o. The end 0 is cutaway laterally and on the outer face to provide the tongue, and narrow strips 3 areplaced on each side and secured to the ring, these strips forming the outer walls of lateral channels, which receivethe flanges of the opposite tongue n, its fiat body portion engaging the rabbet of the tongue 0. In this way a steam-tight joint of eflicient character is'designed to be provided in connection with the backing-rings.

The backing-rings f f have oblique rear wallsf, arranged to form a central opening f t between the same and the inner wall of the peripheral piston-recess for the purpose of providing for a lateral or edgewise pressure of said rings ff to prevent any escape of the steam from the interior of the piston. The rib 7L of the outer packing-ring terminates short of the inner walls of the ringsff, thus enlarging the central chamber before referred to and further providing for lateral or edgewise pressure of said rings.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a piston, the combination with the hollow head having a peripheral recess, and having peripheral openings connecting the interiorof said head and said recess, and faceopenings into the interior of said head, and reciprocating valves in said interior for controlling said face-openings, of an outer packing-ring for said peripheral recess, and the inner packingrings having beveled or oblique inner walls forming a central opening between the same and the inner wall of said recess, substantially as specified.

2. In a piston, the combination with the hollow head, having a peripheral recess, peripheral openings connecting the interior of said head and said recess, and face-openings into the interior of said head, and reciprocating valves in said interior arranged to control said face-openings, of an outer packing-ring for said peripheral recess, and having a central inner rib, and the inner packing-rings upon each side of said rib, and having beveled or oblique inner walls forming a central opening between the same and the inner wall of said recess, substantially as specified.

I11 testimony whereof I ai'fix my signature in presence of two witnesses.

JOHN R. SEEMER. lVitnesses:

RIOHD. B. TAYLOR, BYRON SMALL. 

